DON (Digital Overlay Network)– LOT3


In 1994 Racom NT  built the first high-technology digital SDH Microwave link in Bulgaria for the needs of BTC (now called Vivacom).

In the period from 1996-1997 we have installed and put into operation the entire Digital, SDH and PDH, microwave transmission network of BTC in the country, as part of the DON (Digital Overlay Network) -LOT 3 Project. This digital radio relay network links  more than 100 sites in more than 200 directions.

The subsequent years we have expanded capacity of DON-LOT 3, as built, commissioned and connected many additional sites to the previously build digital microwave network. On most of the main lines we have increased capacity by adding additional radio channels, multiplexing and other facilities.